The 19-year-old actress reportedly called time on her romance with her Twilight co-star because the 23-year-old British actor was making her feel pressured and smothered.
A source told America’s OK! magazine: Robert was talking marriage but she told him they needed a break.
It has also been claimed Kristen felt their relationship was stopping her from spending time with friends and family.
The couple - who have never confirmed their romance, despite being pictured looking intimate on several occasions were also said to have been arguing over how to continue their relationship while living in different countries.
An insider explained: Now The Twilight Saga: Eclipse has finished filming, there’s been a lot of tension about the logistics of their relationship as Robert wants to go back to the UK, while Kristen prefers to stay in Los Angeles.
While filming the third movie in the series, Robert who plays vampire Edward Cullen had been sharing a luxury penthouse apartment with Kristen, who stars as love interest Bella Swann.
The pair had rented out the entire 34th floor of the Sheraton Wall Centre Hotel in Vancouver, Canada, at a cost of $850 a suite each night.
A source said: "They have two rooms joined by a door. They use a third suite on the floor to listen to music or watch Blu-ray movies on a large, flat screen, when they stay in after a day's shooting or on weekends.
"They're great. Every room has floor-to-ceiling windows and large, flat screen TVs and chandeliers. The baths double as Jacuzzis. And, best of all, that floor has its own butler and security. Robert and Kristen are transported to and from the set by accessing a private elevator system in the hotel that leads to a gated and guarded garage."
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